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经营范围
发明名称
Crossing signal
摘要
申请公布号
US2068254(A)
申请公布日期
1937.01.19
申请号
US19350036710
申请日期
1935.08.17
申请人
WILSON MERCER D
发明人
WILSON MERCER D.
分类号
B61L29/28
主分类号
B61L29/28
代理机构
代理人
主权项
地址
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